Electron Energy Loss Spectroscopy Study of the Full Plasmonic Spectrum of Self-Assembled Au-Ag Alloy Nanoparticles: Unraveling Size, Composition, and Substrate Effects

被引：34

作者：

Wu, Yueying ^{[1
]}

Li, Guoliang ^{[2
]}

Cherqui, Charles ^{[3
]}

Bigelow, Nicholas W. ^{[3
]}

Thakkar, Niket ^{[4
]}

Masiello, David J. ^{[3
,4
]}

Camden, Jon P. ^{[2
]}

Rack, Philip D. ^{[1
,5
]}

机构：

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA

[3] Univ Washington, Dept Chem, Seattle, WA 98195 USA

[4] Univ Washington, Dept Appl Math, Seattle, WA 98195 USA

[5] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

来源：

ACS PHOTONICS | 2016年 / 3卷 / 01期

基金：

美国国家科学基金会;

关键词：

plasmonics; alloy nanoparticles; electron energy loss spectroscopy; dewetting; self-assembly; OPTICAL-PROPERTIES; METAL NANOPARTICLES; NOBLE-METAL; GOLD; SHAPE; NANOSPHERES; ABSORPTION; MORPHOLOGY; DISPERSION; CONVERSION;

D O I：

10.1021/acsphotonics.5b00548

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report the self-assembly of ultrasmooth AuxAg1-x, nanoparticles with homogeneous composition via pulsed laser-induced dewetting (PLiD). The nanoparticles are truncated nanospheres that sustain unique plasmonic features. For the first time an electron energy loss spectroscopy (EELS) study elucidating the size and composition effects on the plasmonic modes of truncated AuxAg1-x, nanospheres is carried out. EELS characterization captures a linear red-shift in both bright and dark modes as a function of the atomic fraction of Au and a progressive red-shift of all modes as the size increases. The results are interpreted in the context of Mie theory and electron beam simulations. Armed with the full plasmonic spectrum of the AuxAg1-x, system, the truncated spheres and their ordered arrays synthesized via PLiD have promise as elements in advanced photonic devices.

引用

页码：130 / 138

页数：9

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